Huge 173.14cts Lightning Ridge Rough Seam Opal Grey Base Multicolour Fires/Bars

I have for sale a very nice Rough Lightning Ridge Grey Base seam opal from Australia. This weighs 173.14cts and is 53x38x32mm. Large chunk this one, It is N5/6 with slight N4 potch in places. There is the main bar running through.  Thick in places, thinner round the back, Greens/Pink/Orange pinfire/Mist/Patterns all the way around. Then a bonus Red/Green Bar in the base, if your cutting, that will slice off and likely cut another stone. Great Specimen piece too for a collector. These come around very rarely. Thanks for looking.